1021005545 has 16 divisors (see below), whose sum is σ = 1432801920. Its totient is φ = 683835264.

The previous prime is 1021005541. The next prime is 1021005547. The reversal of 1021005545 is 5455001201.

It is a happy number.

It is not a de Polignac number, because 1021005545 - 2² = 1021005541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021005545.

It is not an unprimeable number, because it can be changed into a prime (1021005541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337700 + ... + 340709.

It is an arithmetic number, because the mean of its divisors is an integer number (89550120).

Almost surely, 2^1021005545 is an apocalyptic number.

It is an amenable number.

1021005545 is a deficient number, since it is larger than the sum of its proper divisors (411796375).

1021005545 is an equidigital number, since it uses as much as digits as its factorization.

1021005545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678464.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1021005545 is about 31953.1773850426. The cubic root of 1021005545 is about 1006.9533866825.

Adding to 1021005545 its reverse (5455001201), we get a palindrome (6476006746).

The spelling of 1021005545 in words is "one billion, twenty-one million, five thousand, five hundred forty-five".